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ICD-9-CM codes were used to select subjects with varicella.
| ICD-9-CM | Description |
|---|---|
| 052.0 | Post-varicella encephalitis |
| 052.1 | Varicella (hemorrhagic) pneumonia |
| 052.2 | Post-varicella myelitis |
| 052.7 | Varicella with other specified complications |
| 052.8 | Varicella with unspecified complication |
| 052.9 | Varicella without mention of complication |
